JPH03195695A - Traction-winding device - Google Patents

Abstract

PURPOSE:To prevent load falling at the time of a light load by setting the shape of a cam surface part so as to release each locking of a pair of nail pieces against the spring force of an elastic member in a nail piece facing condition of a cam one end part, and making switching via a locking condition. CONSTITUTION:A relative cam surface 36 is formed with a cam outer peripheral surface 33, the cam facing surface 34 of a winding nail piece 28, and the cam facing surface 35 of a lowering nail piece 29, and the rotation of a supporting axis 32 around the axis core of the relative cam 30 to oscillate each nail piece 28 and 29. One end of the supporting axis 32 to which the switching cam 30 is fixed is protruded to the front of a manual handle 23, and a switching lever is fixed to the end. The shape of the cam surface part 36 is set so as to release each locking of a pair of nail pieces 28 and 29 against the spring force of a spring member 31 in the nail piece facing condition of a cam one end part 37. The switching from winding operation to lowering operation or the reverse can be made by the switching lever's operation without via a racing condition where respective nail pieces 28 and 29 are not locked to an irregular tooth 27.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a traction hoisting device.

[Problem to be solved by the invention]

-a, as shown in FIG. 8, a disc nut b that is fitted onto the pinion shaft a, and a lowering claw piece that is removably engaged with the uneven teeth C on the outer periphery of the disc nano l-b. In the traction and hoisting device equipped with the hoisting pawl e and the hoisting pawl e, the hoisting pawl e moves from the hoisting operable state in which the hoisting pawl d is locked to the concave and convex teeth C of the disc nut b. Switching to the state in which the lowering operation is possible when the disc naso +-b is locked on the uneven tooth C, or switching from the state in which the lowering operation is possible to the state in which the lowering operation is possible is performed using the SL claw piece d and the lowering claw. The switching pole r with the piece e and its axis g
Rotate it around.) - Then each claw piece de has concave and convex teeth C
The vehicle will go through a so-called idling state in which it completely deviates from the current state. Therefore, when a light load (for example, about 5 to 10 kgf) is applied to the tail footer (not shown), it is difficult to apply the necessary torque (to pinion shaft a) to tighten the brake, and the loaded object There was a risk of a slow fall.

Therefore, in the present invention, switching from hoisting operation to lowering operation,
To provide a traction hoisting device which can switch from a lowering operation to a hoisting operation without going through an idling state, and can prevent the load from dropping when the load is light.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the traction and hoisting device according to the present invention includes a disc nand that is externally fitted onto a pinion shaft, and a disc nand that engages and disengages from uneven teeth on the outer periphery of the disc nand. A lowering claw piece and a lowering claw piece that can be locked, a switching cam interposed between the pair of claw pieces, and a switching cam that engages the pair of claw pieces with the uneven teeth of the disc nut, respectively. In addition, the outer circumferential surface of the cam, the cam-facing surface of the winding claw piece, and the cam-facing surface of the winding-down claw piece form a relative face portion. The above-mentioned pair of pawls are engaged with the concave and convex teeth of the disfuner 7) by the elastic force of the recording member in a state where the disc nand at one end of the cam faces, and , with one end of the cam tilted to one side of the hoisting claw at a predetermined angle of 1, hold the dropping claw piece until the length of the hoisting claw piece described above is engaged with the uneven tooth. The elastic part +4 is swung against the elastic force to release its lock, and the force l,
-・The end of the hook piece for winding the book (11) is tilted at a predetermined angle, and the claw piece for lowering the book is held in the above-mentioned manner while keeping the claw piece for the book book l- engaged with the uneven tooth +tx. The member is swung against the elastic force to release the lock, and further, with the claws at one end of the cam facing each other, each of the pair of claws is unlocked by the elastic force of the elastic member. The shape of the cam surface is set so as to release against force.

(Function) If the cam is placed facing the disc nut at one end of the cam,
The pair of pawl pieces are in a locked state where they are engaged with the concave and convex teeth of the disc nut, and from this state, the cam is rotated around its axis, and one end of the cam is tilted at a predetermined angle to one side of the winding pawl. state, the lowering claw piece is unlocked,
The lowering operation is now possible, and from this state, rotate the cam further in the same direction and attach one end of the cam to the claw piece (lower claw piece).
When they are in the facing state, the lowering pawl pieces are also unlocked, resulting in a so-called idling state. In addition, if the cam is rotated around its axis from the locked state and one end of the cam is tilted toward one side of the lowering claw, the locking of the lowering claw piece will be released. , the winding operation is possible, and if the cam is further rotated in the same direction from this state so that one end of the cam faces the claw piece (lowering claw piece), the second winding claw piece can also be locked. It is released and becomes idle.

Therefore, switching from the winding 1 operation to the winding F operation and from the lowering operation to the winding operation are performed through the docking state without going through the idling state.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing embodiments.

Figures 5, 6, and 7 show the traction winding cover according to the present invention;
This device includes a pinion shaft 1, a load sheave 2 and a disc nut 3 that are fitted onto the pinion shaft L, and the load sheave 2 is equipped with a chain, etc., as shown in FIG. The mold body 4 is wound. Also,
A brake cover 6 is attached to the handle sight plate 5, and a ball 8 held by a ball stay 7 is contained within the brake cover 6. A driven wheel 9 is fitted onto the pinion shirt 1, an interlocking ring 11 is fitted onto the stepped portion 10 of the driven wheel 9, and a ratchet wheel 12 is attached to two brake linings 13 and 13.
It is fitted onto the outside while being held between the two. The pawl 8 and the ratchet wheel 12 are engaged with each other.

Also, the gear side plate 14 has a gear case 1.
5 is attached, and a gear mechanism 16 is contained within the gear case 15. Here, the gear mechanism 16 refers to a pinion gear 17 that meshes with the gear part 1a of the pinion shaft 1.
, a pinion 18 to which the pinion gear 17 is attached, and a load gear 19 that is fitted onto the load sheave 2 and meshes with the pinion 18.

An idling handle 20 is fixed to the disc nut 3, and an idling spring 22 externally fitted onto the shaft 1 is housed inside a large diameter portion 2I on the inner side of the idling handle 20. Further, the manual handle 23 is connected to the brake cover 6
The front end of the shaft 1 is supported so as to be able to swing forward and backward about the axis of the shaft 1, and a ratchet mechanism 24 shown in FIGS. 1 to 4 is contained therein. In addition, Figures 6 and 7
As shown in the figure, a hook member 25 is attached to the upper end of the plate 5.14, and a tail footer 26 is attached to the end of the whole 4.

As shown in FIGS. 1 to 4, the ratchet mechanism 24 includes a hoisting claw piece 28 that removably engages the uneven teeth 27 on the outer periphery of the disc nut 3, and the hoisting claw piece 28. A hoisting claw piece 29 that is removably engaged with the uneven teeth 27 on the outer periphery of the disc nut 3 in the same manner as the piece 28, a switching cam 30 interposed between the pair of claw pieces 28 and 29, Resilient members 31 and 31 that resiliently bias the pair of claw pieces 28 and 29 in the direction of respectively locking the concave and convex teeth 27 of the disc nut 3, and the switching cam 3
0 is fixed to the support shaft 32. That is, the relative cam surface portion 36 includes the cam outer peripheral surface 33, the cam facing surface 34 of the winding claw piece 28, and the cam facing surface 35 of the winding claw piece 29.
The support shaft 32 rotates around its axis to form a cam 30.
rotates, and each claw piece 2829 swings.

Thus, the switching cam 30 has an elliptical shape, and the other end 38 is formed with a substantially square-shaped notch 39 . In addition, the center part of both sides of the switching cam 30 and the other end part 3 of both sides
A notch 40.40.41.41 is formed on the 8 side. The support shaft 32 to which this switching cam 30 is fixed is
One end thereof projects toward the front of the manual handle 23, and as shown in FIG. 5, a switching lever 42 is fixed to the projecting end.

Further, the cam facing surface 34 of the winding pawl piece 28 includes a convex portion 43 and a recessed portion 44, and the cam facing surface 35 of the winding pawl piece 29 also includes a convex portion 45 and a concave portion 46. And each nail piece 2
8.29 is pivotably supported on a shaft portion 52.53, and a resilient member 31.31 made of an iron spring is attached to this shaft portion 52.53.
is attached.

A pressing mechanism 47 for pressing the cam 30 toward the disc nut 3 is provided below the cam 30. Here, the pressing mechanism 47 includes a pressing rod 48 and the pressing rod 4.
It consists of a frame 49 in which 8 is a storage shape, and a resilient member 50 made of a coil spring that is stored in the frame 49 with the press rod 48 inserted, and the resilient member 50 is The force constantly presses the pressing rod 48 in the direction of the arrow.

Therefore, as shown in FIG. 1, one end 37 of the cam is in a state where it faces the claw piece (winding claw piece) (in other words, the other end 38 of the cam is in a state where it is facing the lowering claw piece, and the cam lengthwise direction is In a state in which the longitudinal direction of the manual handle is substantially perpendicular to the longitudinal direction of the manual handle, the conical end portion 51 of the press rod 48 engages with one of the notches 40, and the cam 30 is held in that state. Further, in the state shown in FIG. 2, the tip conical portion 51 engages with the other notch 41, and in the state shown in FIG. 3, the tip conical portion 51 engages with the notch 39, and as shown in FIG. In the state shown, the tip conical portion 51 is connected to one notch 4.
1 to maintain the respective states of the cams 30.

In the state shown in FIG. 1, the cam 30 has one end 37 in sliding contact with the convex part 43 and the other end 38 in sliding contact with the convex part 43.
5, each claw piece 28, 29 is in a state where it is not engaged with the uneven teeth 27 of the disc nut 3 (separated state), and as shown in FIG. is at a predetermined angle (for example, 30° to 60°) on the lowering claw piece 29 side.
lfl In the tilted state and the conical end portion 51 is engaged with the other notch 41, one end 37 of the cam is in sliding contact with the convex portion 45, and the other end 38 of the cam is in sliding contact with the recess 44. (or a state where there is a minute gap), the winding pawl piece 28 is locked to the uneven teeth 27, and the winding down pawl piece 29 is uneven! 27 is released. In other words, it is in a rolled up state.

Further, in the state shown in FIG. 3, the side surface of the cam 30 is in sliding contact with the convex portion 43.45 (or with a minute gap), and each claw piece 28.29 is in contact with the concave and convex tooth 27. It is locked. In other words, it is in a locked state.

As shown in FIG. 4, one end 37 of the cam is inclined at a predetermined angle (for example, 30° to 60°) toward the winding pawl 28, and the conical end portion 51 is attached to one notch 41. In the engaged state, one end 37 of the cam is in sliding contact with the protrusion 43, and the other end 38 of the cam is in sliding contact with the recess 46 (or there is a slight gap), so that the lowering claw The piece 29 engages with the concave and convex teeth 27, and the winding claw piece 28 engages with the concave and convex teeth 2.
7 is released. In other words, it is in a state where it can be lowered.

Therefore, in order to switch from the hoisting operation state shown in FIG. 2 to the hoisting down operation state shown in FIG. After passing through the locked state shown in FIG. 3, the state changes to the lowering operation state shown in FIG. 4. In addition, in order to switch from the lowering operation state shown in FIG. 4 to the lowering operation state shown in FIG. After going through the locked state, it switches to the state shown in FIG. In other words, when switching from hoisting operation to hoisting operation and from hoisting operation to hoisting tM operation, each claw piece 28, 29 is not engaged with the uneven teeth 27 as shown in FIG. This can be done without going through.

In addition, when the switching lever 42 is in the state (vertical state) along the longitudinal direction of the manual handle 23 as shown in FIG. 6, it is in the locked state shown in FIG. In the substantially orthogonal state (horizontal state), the idling state shown in FIG. 1 is established (in this case, contrary to the case shown in FIG. It may be in sliding contact with.

), if the switching lever 42 is swung toward the lowering pawl 29 side from the state shown in FIG. 6, the hoisting operation becomes possible as shown in FIG. When the lever 42 is swung toward the lowering pawl 28, the lowering operation becomes possible as shown in FIG. 4.

Note that the present invention is not limited to the above-described embodiments, and the design may be changed without departing from the gist of the present invention. The shape of the cam-facing surface 35 of the lower claw piece 29 is not limited to the one shown in the illustration, and can be used when switching from a state in which hoisting operation is possible to a state in which hoisting down operation is possible, and when switching from a state in which hoisting operation is possible to a state in which hoisting operation is possible. When switching to the lowering state, the state goes through the locked state as shown in FIG. The claw pieces 28 and 29 are now in a state where they are removed from the concave and convex teeth 27, and one end 37 of the cam 30 is further removed from the state shown in FIG.
When the winding claws 28 and 29 are swung toward the hoisting claws 28, each claw
Any shape is sufficient as long as it is in a state where it comes off from the uneven teeth 27. In other words, the shape of the relative cam surface portion 36 is not limited to that illustrated.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

Switching from hoisting operation to lowering operation and from lowering operation to hoisting operation can be performed via the locked state without passing through the idling state of the disc nut 3, and the load at light load can be changed. It is safe and can effectively prevent falling.
It becomes easy to use.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional side view of essential parts of an embodiment of the present invention, and FIG.
The figure is an enlarged cross-sectional side view of the main part in the hoisting state, FIG. 3 is an enlarged cross-sectional side view of the main part in the locked state, FIG. 4 is an enlarged cross-sectional side view of the main part in the lowering state, and FIG. FIG. 6 is a side view, and FIG. 7 is a rear view. FIG. 8 is an enlarged cross-sectional side view of the main part of the conventional example. 1... Pinion shaft, 3... Disc nut,
27... Uneven teeth, 28... Winding claw piece, 29...
Lowering pawl piece, 30... Switching cam, 31... Resilient member, 33... Cam outer peripheral surface, 34, 35... Cam opposing surface, 36... Relative cam surface portion, 37... ...One end of the cam. Fig. 1 Fig. Fig. Fig. 6 Fig. Fig. 6

Claims (1)

[Claims] 1. Disc nut 3 fitted onto pinion shaft 1
, a hoisting pawl 28 and a hoisting pawl 29 that are removably engaged with the uneven teeth 27 on the outer periphery of the disc nut 3, and a switching cam interposed between the pair of pawls 28, 29. 30, and resilient members 31, 31 that resiliently bias the pair of claw pieces 28, 29 in a direction to respectively lock the concave and convex teeth 27 of the disc nut 3.
In addition, the cam outer peripheral surface 33 and the winding claw piece 28
, and the cam facing surface 35 of the lowering claw piece 29.
This is a towing and hoisting device in which a relative cam surface portion 36 is formed with the cam end portion 37 and the pair of claws 28 and 29 are moved by the elastic force of the elastic members 31 and 31 when the disk nut of the cam end portion 37 is facing each other. The hoisting claw piece 29 is engaged with the uneven teeth 27 of the disc nut 3, and the cam end portion 37 is inclined at a predetermined angle toward the hoisting claw piece 28.
The hoisting claw piece 28 is held in place by the elastic member 31.
The lock is released by swinging against the elastic force of the cam, and the hoisting claw piece 28 is rotated with the one end portion 37 of the cam tilted at a predetermined angle toward the hoisting claw piece 29 side. Uneven tooth 27
The lowering claw piece 29 is held in place by the resilient member 31.
The lock is released by swinging against the resilient force of the cam, and further, with the claws of the one end portion 37 of the cam facing each other, each of the pair of claws 28 and 29 is unlocked by the resilient force. A traction hoisting device characterized in that the shape of the cam surface portion 36 is set so as to be released against the elastic force of the members 31, 31.